X-ray absorption of BaBiO sub 3 and superconducting BaBi sub 0. 25 Pb sub 0. 75 O sub 3

Journal Article · Sun Apr 01 00:00:00 EST 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.41.6306· OSTI ID:6837557

Boyce, J B ^[1]; Bridges, F G ^[2]; Claeson, T ^[3]; Geballe, T H ^[4]; Remeika, J M ^[5]

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1. Xerox Palo Alto Research Center, Palo Alto, California 94304 (USA)
2. Department of Physics, University of California, Santa Cruz, California 95064 (USA)
3. Physics Department, Chalmers University of Technology, S-41296 Goeteborg, Sweden (SE)
4. Department of Applied Physics, Stanford University, Stanford, California 94305 (USA)
5. AT T Bell Laboratories, Murray Hill, New Jersey 07974 (USA)

X-ray-absorption studies of BaBiO{sub 3} and superconducting BaBi{sub 0.25}Pb{sub 0.75}O{sub 3} (Ba-Bi-Pb-O) did not show any structural transformations altering the gross-scale near-neighbor environment or the valence between 4 and 300 K. Two Bi-O distances, separated by about 0.17 A, could be distinguished for BaBiO{sub 3}. Also in Ba-Bi-Pb-O, there is a strong indication of two different Bi-O distances, separated by about 0.12 A, but only one Pb-O distance. The differing Bi-O separations may be connected with local spatial charge fluctuations. The valence states of the two differently located Bi atoms could not be conclusively determined from the absorption-edge shape, but the Bi and Pb near-edge structures for Ba-Bi-Pb-O are nearly identical. The Bi-O and Pb-O vibrational frequencies, considered important for superconductivity, could be estimated from the temperature dependence of the broadening of the nearest-neighbor distributions; they correspond to Einstein temperatures of about 500 K.

• OSTI ID: 6837557
• Journal Information: Physical Review, B: Condensed Matter; (USA), Vol. 41:10; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
CRYSTAL-PHASE TRANSFORMATIONS
BISMUTH OXIDES
LEAD OXIDES
BOND LENGTHS
MEDIUM TEMPERATURE
SUPERCONDUCTIVITY
TEMPERATURE DEPENDENCE
ULTRALOW TEMPERATURE
VALENCE
VERY LOW TEMPERATURE
VIBRATIONAL STATES
X-RAY SPECTROSCOPY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BISMUTH COMPOUNDS
CHALCOGENIDES
DIMENSIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ENERGY LEVELS
EXCITED STATES
LEAD COMPOUNDS
LENGTH
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
SPECTROSCOPY
360202* - Ceramics
Cermets
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Cermets
& Refractories- Physical Properties